Mathias kktjdewig



(No Model.) 3 Sheets-Sheet 1.

. KRUDEWIG. SMOKE AND GAS OONSUMiNG FURNACE. 7 No. 305,457. Patented Sept. 23, 1884.

3 Sheets-$heet 2.

(No Model.)

y M.KRUDEWIQ SMOKE AND GAS OONSUMING FURNACE. 'No.30&457;

Patented Sept. 23, 1884.

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(No Model.) 3 Sheet s-'-Sheet 3.

M. KRUDEWIG. SMOKE AND GAS GONSUMING FURNACE.

'No.305,457. u Patented Sept.23,18i84.

@ UNITED. STAT S MATHIAS KRUDEWIG, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO HIMSELF, AND WVILLIAM KLOH AND ISIDOR HYMES, BOTH OF NEWV YORK, N. Y.

SMOKE AND GAS CONSUMING FURNACE.

SPECIFICATION forming part Of Letters Patent N0. 305,457, dated September 23, 1884-.

A Application filed May 9, 1883. (No model.)

To all whom it may concern:

Be it known that I,- MATHIAs KRUDEWIG, of Frankfort-on-the-Main, in the Empire of Germany,have invented a new and useful 7 Improvement in Smoke and Gas Consuming Furnaces; and I do hereby declare that the following is a full and exact description thereof, reference being had tothe accompanying drawings, and to the letters of reference marked 10 thereon, making a part of this specification.

My invention relates to 37.116 construction of smoke-consuming furnace.

It consists in the combination of a bin or reservoir placed within the furnace, with an I 5 inclined grate, a series of sliding blocks or plungers fitted to reciprocate back, and forth under the fuel-aperture upon the upper end of the grate, and actuated by a rock-shaft and lever outside of the furnace, and with a series of air-fines in the sides and top of the furnace to produce a delivery of hot air into the firebox over the fire, and with a slide and register, as hereinafter fully described.

In the drawings, Figure l is a front view of my improved furnace; Fig. 2, a vertical crosssection of the same on thelinec c, Fig. 3. Fig. 3 is a vertical longitudinal section of the same on the line 70k, Fig. 1. Fig. 4 is a horizontal section of. the same on the line 0 It, Fig. 1.

A-in said drawings represents the fire-box or combustion-chamber of my improved furnace; B, the inclined grate; O, the ash-pit; D, a bin or reservoir for fuel, formed within the furnace over the front or upper end of the grate.

' E is a hot-air chamber formed over the firebox.

F is the mouth of the furnace, from which its heat and products of combustion are led 4- off under the boiler to be heated.

The inclined grate, or in some cases its upper end only, is constructed of a series of parallel bars, N N, having teeth which project, like the teeth of a comb, from said plates. The plates N N, with their projecting teeth b b, are arrangedhorizontally one over the other, so that the teeth of the one tier of plates shall project over the solidportion of the plates beneath, as shown, the front ends of the teeth being beveled to form an incline. By this arbottom of the fire-box.

ran gement the ashes and unconsumed fuel falling from each upper tier drop upon the tier below it, where they are subjected to a fresh draft of air, and their combustion so promoted thereby, by reason of a fresh supply of oxygen, as to burn up finally all the combustible matter. The constant progression of the fuel over the grate-bars for this purpose is assisted by a mechanical pushing forward of the fresh fuel by means of the pushers or pistons e e, arranged at the upper end of the grate, to slide back and forth thereon. The plate or plates N-of the upper tier may be set at an inclination corresponding with the plane of inclination of the teeth of the'tier below, and the teeth I) of these upper plates are beveled on their under side, so as to leave a horizontal opening of uniform width between the upper tier and that next below. The grate may be constructed entirely of these comb-plates; or in many cases I prefer to construct the upper part only of the inclined grate with said plates, and the lower portion of a series of parallel hollow grate-bars, c c, which are supported at an inclinationconforming to that required in the grate. The lower ends of these bars 0 are left open and terminate immediately over a hinged plate or door, a, at the An opening is formed on the under side of their upper flanges, f, so that a current of air will be constantly drawn through them from the ash-pit below and discharged therefrom into the bottom of the firebox against its rear wall. This current of air passing through each. bar Q will not only cool it and prevent it from burning out, but, becoming thoroughly heated, will, when discharged into the fire-box, serve to produce a perfect combustion of the smoke and gases therein.

The hinged door a in the bottom of the firebox and at the lower end of the grate is opened from without by means of a lever, H, for the purpose of discharging any clinker or ashes accumulating thereon. The pushers or plungers e 6, adapted to slide back and forth on the upper end of the grate, are each connected by a coupling-rod with a crank-shaft, 9, supported in brackets upon the outside of the furnace, and which is oper- 10o nace, as shown. Theheight at which the slide 5 that the plungers shall reciprocate alternately,

so that as one advances that next to it will move back, and vice versa. The upper surface of this series of plungers e is made to con- 'stitute the bottom of the coal binor reservoir D, formed in the upper front, portion of the furnace, so that the coal shall drop from the bin over the front edge of the plungers down upon the grate, its delivery from the bin being controlled or arrested by means of a one end thereof, whose shorter arm is connected to the slide by a link, h, and whose longer arm projects out in front of the fur- J is set determines the depth of the fuel upon the grate.

The coal is fedinto the bin D through a chute or front hopper, I, closed by a door, d.

To complete the combustion within the firechamber of the furnace, an air-inlet passage, 73, .is formed over the top of the bin D, to extend down behind it and open into the firebox immediately in front of the feed-opening that is closed by the slide J. This air-passageis governed by a register, L, at the front of the furnace. Air-passages is k are also formed in the side walls of the furnace,to lead 7 y 3 5 from the front thereof to the rear, and thence back again, to communicate with the side of vertical slide, J, on the rear side of the bin. This. slide is moved up and down by means of a lever, K, pivoted to the side of the bin, at

the cold-air passage '5, so as to deliver a vol ume of heated air in front of the fuel enterimg the fire box of the top of the grate. A circulation of air is also established, by means of suitable passages, Z, between theair-chamber E, over thefurnace, and the air-inlet i, to heat thereby the air-supply furnished to the fire 7 box.

The discharge opening or mouth F of the furnace is above the level of the upper end of the grate, and for use with a Cornish boiler the furnace is built in front of the boiler and its mouth is extended into the central flue thereof, as shown in Fig. 3. In this case the mouth E of the furnace is adapted to extend into the end of the flue, a non-conducting lining being interposed to protect the seam or joint of the flue and boiler, and supported by means of a metallic band or Wing, m. The door J, it will be seen, is above the plungers e, that'have been pushed inward; otherwise it would obstruct the action of the plungers.

I claim The combination, in a furnace, of the inclined grate B, firebox A, plungers c e, fuelbin D, air-passagesk k and i, with the slide J, register L, and bottom door, a, substantially as herein shown and described.

In testimony whereof Ihave signed my name to this specification in the presenceof two subscribing witnesses.

MATHIAS KRUDEWIG.

Witnesses:

A. S. HOGUE, J. GRUND. 

